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#37832.1

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add support for indexing in `@atomic` macro (#54707)

Following the discussion in #54642

Implemented:
- [x] `modifyindex_atomic!`, `swapindex_atomic!`, `replaceindex_atomic!`
for `GenericMemory`
- [x] `getindex_atomic`, `setindex_atomic!`, `setindexonce_atomic!` for
`GenericMemory`
- [x] add support for references in `@atomic` macros
- [x] add support for vararg indices in `@atomic` macros 
- [x] tests
- [x] update docstrings with example usage
- ~[ ] update Atomics section of the manual (?)~
- [x] news

@oscardssmith @vtjnash 

# New `@atomic` transformations implemented here:
```julia
julia> @macroexpand (@atomic a[i1,i2])
:(Base.getindex_atomic(a, :sequentially_consistent, i1, i2))

julia> @macroexpand (@atomic order a[i1,i2])
:(Base.getindex_atomic(a, order, i1, i2))

julia> @macroexpand (@atomic a[i1,i2] = 2.0)
:(Base.setindex_atomic!(a, :sequentially_consistent, 2.0, i1, i2))

julia> @macroexpand (@atomic order a[i1,i2] = 2.0)
:(Base.setindex_atomic!(a, order, 2.0, i1, i2))

julia> @macroexpand (@atomicswap a[i1,i2] = 2.0)
:(Base.swapindex_atomic!(a, :sequentially_consistent, 2.0, i1, i2))

julia> @macroexpand (@atomicswap order a[i1,i2] = 2.0)
:(Base.swapindex_atomic!(a, order, 2.0, i1, i2))

julia> @macroexpand (@atomic a[i1,i2] += 2.0)
:((Base.modifyindex_atomic!(a, :sequentially_consistent, +, 2.0, i1, i2))[2])

julia> @macroexpand (@atomic order a[i1,i2] += 2.0)
:((Base.modifyindex_atomic!(a, order, +, 2.0, i1, i2))[2])

julia> @macroexpand (@atomiconce a[i1,i2] = 2.0)
:(Base.setindexonce_atomic!(a, :sequentially_consistent, :sequentially_consistent, 2.0, i1, i2))

julia> @macroexpand (@atomiconce o1 o2 a[i1,i2] = 2.0)
:(Base.setindexonce_atomic!(a, o1, o2, 2.0, i1, i2))

julia> @macroexpand (@atomicreplace a[i1,i2] (2.0=>3.0))
:(Base.replaceindex_atomic!(a, :sequentially_consistent, :sequentially_consistent, 2.0, 3.0, i1, i2))

julia> @macroexpand (@atomicreplace o1 o2 a[i1,i2] (2.0=>3.0)... (continued)

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Source Files on job #37832.1